Bibtex of String / Necklace

@article{Cattell2000, 
     author = "Cattell, Kevin and Ruskey, Frank and Sawada, Joe and Serra, Micaela and Miers, C.Robert", 
     doi = "10.1006/jagm.2000.1108", 
     issn = "01966774", 
     journal = "Journal of Algorithms", 
     link = "http://linkinghub.elsevier.com/retrieve/pii/S0196677400911088 http://www.sciencedirect.com/science/article/pii/S0196677400911088", 
     month = "nov", 
     number = "2", 
     pages = "267--282", 
     title = "Fast Algorithms to Generate Necklaces, Unlabeled Necklaces, and Irreducible Polynomials Over GF(2)", 
     uri = "http://linkinghub.elsevier.com/retrieve/pii/S0196677400911088", 
     volume = "37", 
     year = "2000", 
}

@article{Fredricksen1978a, 
     author = "Fredricksen, Harold and Maiorana, James", 
     doi = "10.1016/0012-365X(78)90002-X", 
     issn = "0012365X", 
     journal = "Discrete Mathematics", 
     link = "http://www.sciencedirect.com/science/article/pii/0012365X7890002X http://linkinghub.elsevier.com/retrieve/pii/0012365X7890002X", 
     month = "jan", 
     number = "3", 
     pages = "207--210", 
     title = "Necklaces of beads in k colors and k-ary de Bruijn sequences", 
     uri = "http://www.sciencedirect.com/science/article/pii/0012365X7890002X", 
     volume = "23", 
     year = "1978", 
}

@article{Fredricksen1986b, 
     author = "Fredricksen, Harold and {J. Kessler}, Irving", 
     doi = "10.1016/0012-365X(86)90089-0", 
     issn = "0012365X", 
     journal = "Discrete Mathematics", 
     link = "http://www.sciencedirect.com/science/article/pii/0012365X86900890 http://linkinghub.elsevier.com/retrieve/pii/0012365X86900890", 
     month = "sep", 
     number = "2-3", 
     pages = "181--188", 
     title = "An algorithm for generating necklaces of beads in two colors", 
     uri = "http://www.sciencedirect.com/science/article/pii/0012365X86900890", 
     volume = "61", 
     year = "1986", 
}

@article{Ruskey1992, 
     author = "Ruskey, Frank and Savage, Carla and {Min Yih Wang}, Terry", 
     doi = "10.1016/0196-6774(92)90047-G", 
     issn = "01966774", 
     journal = "Journal of Algorithms", 
     keyword = "05-04,1,68r05,68r15,ams subject classifications,cat algorithm,difference covers,fixed density,generate,introduction,lyndon words,necklaces,pii,produc-,s0097539798344112,there are many reasons,to develop algorithms for", 
     link = "http://www.sciencedirect.com/science/article/pii/019667749290047G http://linkinghub.elsevier.com/retrieve/pii/019667749290047G", 
     month = "sep", 
     number = "3", 
     pages = "414--430", 
     title = "Generating Necklaces", 
     uri = "http://www.sciencedirect.com/science/article/pii/019667749290047G", 
     volume = "13", 
     year = "1992", 
}

@article{Ruskey1999, 
     author = "Ruskey, Frank and Sawada, Joe", 
     doi = "10.1137/S0097539798344112", 
     issn = "0097-5397", 
     journal = "SIAM Journal on Computing", 
     keyword = "05-04,1,68r05,68r15,ams subject classifications,cat algorithm,difference covers,fixed density,generate,introduction,lyndon words,necklaces,pii,produc-,s0097539798344112,there are many reasons,to develop algorithms for", 
     link = "http://link.aip.org/link/SMJCAT/v29/i2/p671/s1\&Agg=doi http://epubs.siam.org/doi/abs/10.1137/S0097539798344112", 
     month = "jan", 
     number = "2", 
     pages = "671--684", 
     title = "An Efficient Algorithm for Generating Necklaces With Fixed Density", 
     uri = "http://link.aip.org/link/SMJCAT/v29/i2/p671/s1&Agg=doi", 
     volume = "29", 
     year = "1999", 
}

@article{Sawada2003a, 
     author = "Sawada, Joe", 
     doi = "10.1016/S0304-3975(03)00049-5", 
     issn = "03043975", 
     journal = "Theoretical Computer Science", 
     keyword = "CAT algorithm,Combinatorial optimization,Exhaustive generation,Fixed content,Lyndon word,Necklace,cat algorithm,combinatorial,exhaustive generation,fixed content,lyndon word,necklace", 
     link = "http://www.sciencedirect.com/science/article/pii/S0304397503000495 http://linkinghub.elsevier.com/retrieve/pii/S0304397503000495", 
     month = "may", 
     number = "1-3", 
     pages = "477--489", 
     title = "A Fast Algorithm to Generate Necklaces With Fixed Content", 
     uri = "http://www.sciencedirect.com/science/article/pii/S0304397503000495", 
     volume = "301", 
     year = "2003", 
}

@article{Wang1996, 
     author = "Wang, Terry Min Yih and Savage, Carla D.", 
     doi = "10.1137/S089548019528143X", 
     issn = "0895-4801", 
     journal = "SIAM Journal on Discrete Mathematics", 
     link = "http://link.aip.org/link/SJDMEC/v9/i4/p654/s1\&Agg=doi http://epubs.siam.org/doi/abs/10.1137/S089548019528143X", 
     month = "nov", 
     number = "4", 
     pages = "654--673", 
     title = "A Gray Code for Necklaces of Fixed Density", 
     uri = "http://link.aip.org/link/SJDMEC/v9/i4/p654/s1&Agg=doi", 
     volume = "9", 
     year = "1996", 
}